Using a large mouth jar or glass (you want something that the immersion blender can just fit into) add the egg, lemon juice and mustard. Test that putting the immersion blender in the ingredients come up to the blades (this will ensure it fully emulsifies).
Remove the blender, add the garlic, salt and pour in the oil. Let the mixture set for 1 minute to slightly combine before blending. Add your immersion blender, and process on high. Once the mixture starts to emulsify, gently tilt the blender to the side and slowly rise to the top to fully blend everything together. This process should take about 1 minute.
1 clove garlic, 1 cup avocado oil, ½ teaspoon salt
Cover and store in the fridge for up to 2 weeks.
Notes
Don’t have an immersion blender? Use a small food processor or a food processor that has a small bowl insert. If the egg, lemon juice, and mustard do not reach the blades before adding the oil, double the recipe.